New Delhi, Nov. 24 -- The protest over Delhi's air pollution turned controversial on Sunday when demonstrators at Delhi's India Gate displayed posters of top Maoist commander Madvi Hidma, who was killed in a police encounter in Andhra Pradesh last week.

The Delhi Police said they arrested over 15 people for allegedly refusing to disperse during a protest on Sunday. Police also said the protesters allegedly used chilli spray on police personnel.

"The Delhi Police registered an FIR and arrested more than 15 people for using chilli spray on Police personnel, obstructing official work and blocking the road. Relevant sections invoked in the FIR," officials told ANI.

The protest was held at the C hexagon on India Gate in New Delhi on Sunday,...